[Bug]: lightbox accessibility issues

Description

[x] Light box magnifying glass is contained by a semantically appropriate element (button)
[x] Light box magnifying glass can be tabbed to
[x] light box can be opened with a keyboard once magnifying glass is focused
[x] the close x can be tabbed to once the lightbox is opened
[x] the close x is contained by a semantically appropriate element (button)
[x] the close x is has text content
[x] the close x returns user to focus on the appropriate magnifying glass.

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